Phantom electric motor system with parallel coils
First Claim
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1. An electric motor system comprising:
- a rotor comprised of a magnetic material;
a plurality of receive coils, wherein each receive coil in the plurality of receive coils has an axis and a resonant frequency that is different from a resonant frequency of each other receive coil in the plurality of receive coils and wherein the plurality of receive coils are positioned with respect to the rotor such that a receive magnetic field generated by each receive coil in the plurality of receive coils attracts the rotor;
a transmit coil, wherein the transmit coil is positioned with respect to the plurality of receive coils such that magnetic field lines of a transmit magnetic field generated by the transmit coil pass through each receive coil in the plurality of receive coils substantially parallel to the axis of each receive coil in the plurality of receive coils; and
a controller configured to control the transmit coil to generate the transmit magnetic field at a plurality of different transmit frequencies corresponding to the resonant frequencies of each receive coil in the plurality of receive coils in sequence thereby to cause each receive coil to generate the receive magnetic field in sequence.
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Abstract
A method and apparatus for operating an electric motor is presented. A transmit magnetic field is received at a group of receive coils having a group of axes oriented substantially parallel to magnetic field lines from a transmit coil and having a group of resonant frequencies. A resonant frequency in the group of resonant frequencies is different from other receive coils in the group of receive coils. A receive magnetic field is generated at a receive coil in the group of receive coils having the resonant frequency when the transmit magnetic field has a selected frequency matching the resonant frequency. The receive magnetic field attracts a rotor in the electric motor.
108 Citations
15 Claims
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1. An electric motor system comprising:
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a rotor comprised of a magnetic material; a plurality of receive coils, wherein each receive coil in the plurality of receive coils has an axis and a resonant frequency that is different from a resonant frequency of each other receive coil in the plurality of receive coils and wherein the plurality of receive coils are positioned with respect to the rotor such that a receive magnetic field generated by each receive coil in the plurality of receive coils attracts the rotor; a transmit coil, wherein the transmit coil is positioned with respect to the plurality of receive coils such that magnetic field lines of a transmit magnetic field generated by the transmit coil pass through each receive coil in the plurality of receive coils substantially parallel to the axis of each receive coil in the plurality of receive coils; and a controller configured to control the transmit coil to generate the transmit magnetic field at a plurality of different transmit frequencies corresponding to the resonant frequencies of each receive coil in the plurality of receive coils in sequence thereby to cause each receive coil to generate the receive magnetic field in sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating an electric motor, the method comprising:
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receiving a transmit magnetic field at a plurality of receive coils wherein each receive coil in the plurality of receive coils has an axis that is oriented substantially parallel to magnetic field lines of the transmit magnetic field, wherein each receive coil in the plurality of receive coils has a resonant frequency that is different from a resonant frequency of each other receive coil in the plurality of receive coils, wherein each receive coil in the plurality of receive coils generates a receive magnetic field in response to receiving the transmit magnetic field at the resonant frequency of the receive coil, and wherein the plurality of receive coils are positioned with respect to a rotor in the electric motor such that the receive magnetic field generated by each receive coil in the plurality of receive coils attracts the rotor in the electric motor; and controlling a transmit coil to generate the transmit magnetic field at a plurality of different transmit frequencies corresponding to the resonant frequencies of each receive coil in the plurality of receive coils in sequence thereby to cause each receive coil to generate the receive magnetic field in sequence. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification